Buspirone N-oxide is a metabolite of buspirone. Buspirone is an anxiolytic psychoactive drug of the azapirone chemical class, and is primarily used to treat generalized anxiety disorder (GAD) Bristol-Myers Squibb (BMS) gained FDA approval of buspirone in 1986 for treatment of GAD. The patent on Buspar by Bristol-Myers Squibb expired in 2001, and buspirone is available as a generic. (Wikipedia)